61 lines
1.7 KiB
C#
61 lines
1.7 KiB
C#
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using System;
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using System.Diagnostics;
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namespace PCL.Core.Utils;
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/// <summary>
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/// 帮助动画帧的工具类。
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/// </summary>
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public static class FrameUtils
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{
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public static long Frequency { get; }
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static FrameUtils()
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{
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Frequency = Stopwatch.Frequency;
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}
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/// <summary>
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/// 获取现在的时间戳。
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/// </summary>
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/// <returns>时间戳。</returns>
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public static long NowStamp() => Stopwatch.GetTimestamp();
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/// <summary>
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/// 将时间戳转换为帧索引。
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/// </summary>
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/// <param name="startStamp">开始时的时间戳。</param>
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/// <param name="fps">帧率。</param>
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/// <returns>帧索引。</returns>
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public static long StampToFrameIndex(long startStamp, int fps)
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{
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// 计算经过的时间戳
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var durationStamp = NowStamp() - startStamp;
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if (durationStamp <= 0) return 0;
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// 计算帧索引
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var index = durationStamp * fps / Frequency;
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return index;
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}
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/// <summary>
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/// 将时间跨度转换为帧索引。
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/// </summary>
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/// <param name="startTime">开始时的时间。</param>
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/// <param name="currentTime">当前时间。</param>
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/// <param name="fps">帧率。</param>
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/// <returns>帧索引。</returns>
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public static long TimeSpanToFrameIndex(TimeSpan startTime, TimeSpan currentTime, int fps)
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{
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// 如果当前时间早于开始时间，则返回0
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if (currentTime < startTime) return 0;
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// 计算经过的时间
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var duration = currentTime - startTime;
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// 计算帧索引
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var index = (long)(duration.TotalSeconds * fps);
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return index;
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}
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}
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